fix(bug): fix issue on Windows with generating declaration maps

src/declaration/emit-declarations.ts

@@ -18,7 +18,7 @@ import {
 import {CompilerOptions, createPrinter} from "typescript";
 import {OutputBundle, OutputOptions, PluginContext, SourceDescription} from "rollup";
 import {ModuleDependencyMap} from "../util/module/get-module-dependencies";
-import {setExtension} from "../util/path/path-util";
+import {ensurePosix, setExtension} from "../util/path/path-util";
 import {DECLARATION_EXTENSION, DECLARATION_MAP_EXTENSION, ROLLUP_PLUGIN_MULTI_ENTRY} from "../constant/constant";
 import {TypescriptPluginOptions} from "../plugin/i-typescript-plugin-options";
 import {Resolver} from "../util/resolve-id/resolver";
@@ -108,17 +108,22 @@ export function emitDeclarations(options: EmitDeclarationsOptions) {
 					? declarationMapFilename
 					: parse(rewrittenAbsoluteDeclarationMapFilename).base;
 
-			let emitFileDeclarationFilename = join(relative(relativeOutDir, relativeDeclarationOutDir), rewrittenDeclarationFilename);
-			let emitFileDeclarationMapFilename = join(relative(relativeOutDir, relativeDeclarationOutDir), rewrittenDeclarationMapFilename);
+			// We'll need to work with POSIX paths for now
+			let emitFileDeclarationFilename = ensurePosix(join(relative(relativeOutDir, relativeDeclarationOutDir), rewrittenDeclarationFilename));
+			let emitFileDeclarationMapFilename = ensurePosix(join(relative(relativeOutDir, relativeDeclarationOutDir), rewrittenDeclarationMapFilename));
 
 			// Rollup does not allow emitting files outside of the root of the whatever 'dist' directory that has been provided.
-			while (emitFileDeclarationFilename.startsWith("../")) {
+			while (emitFileDeclarationFilename.startsWith("../") || emitFileDeclarationFilename.startsWith("..\\")) {
 				emitFileDeclarationFilename = emitFileDeclarationFilename.slice("../".length);
 			}
-			while (emitFileDeclarationMapFilename.startsWith("../")) {
+			while (emitFileDeclarationMapFilename.startsWith("../") || emitFileDeclarationMapFilename.startsWith("..\\")) {
 				emitFileDeclarationMapFilename = emitFileDeclarationMapFilename.slice("../".length);
 			}
 
+			// Now, make sure to normalize the file names again
+			emitFileDeclarationFilename = normalize(emitFileDeclarationFilename);
+			emitFileDeclarationMapFilename = normalize(emitFileDeclarationMapFilename);
+
 			const rawLocalModuleNames = chunk.modules;
 			const localModuleNames = rawLocalModuleNames.filter(options.canEmitForFile);
 			const rawEntryFileName = rawLocalModuleNames.slice(-1)[0];

src/declaration/pre-bundle-declarations-for-chunk.ts

@@ -32,7 +32,8 @@ export function preBundleDeclarationsForChunk(options: PreBundleDeclarationsForC
 	program.emit(
 		undefined,
 		(file, data) => {
-			const replacedFile = normalize(file.replace(generatedOutDir, "").replace(options.cwd, ""));
+			const normalizedFile = normalize(file);
+			const replacedFile = normalize(normalizedFile.replace(generatedOutDir, "").replace(options.cwd, ""));
 			const replacedFileDir = normalize(dirname(replacedFile));
 
 			if (replacedFile.endsWith(DECLARATION_MAP_EXTENSION)) {
@@ -56,7 +57,9 @@ export function preBundleDeclarationsForChunk(options: PreBundleDeclarationsForC
 						const absoluteSource = join(options.absoluteDeclarationMapDirname, source);
 						const chunkFileNameResult = getChunkFilename({...options, fileName: absoluteSource});
 						return chunkFileNameResult != null && chunkFileNameResult.fileName === options.absoluteChunkFileName;
-					});
+					})
+					// Make sure that the paths are POSIX-based
+					.map(ensurePosix);
 
 				// If there are sources for this chunk, include it
 				if (parsedData.sources.length > 0) {